Spirit-level.



No 808,862. PATENTED JAN Z, 1906 J. A. MOCAIN. SPIRIT LEVEL.

AAAAAAAAAAAAAAAAA me, 1905.

UNITED STATES PATENT OFFICE.

JOHN A. MCCAIN, OF ATLANTA, GEORGIA, ASSIGNOR ONE-HALF TO LOUIS J.GASSELS, OF DECATUR, GEORGIA.

SPIRIT-LEVEL.

Specification of Letters Patent.

Patented Jan. 2, 1906.

To all whom it may concern:

Be it known that I, JoHN A. MCCAIN, a citizen of the United States,residing at Atlanta, in the county of Fulton, State of Georgia, haveinvented certain new and useful Improvements in Spirit-Levels, of whichthe following is a specification.

My invention relates to leveling and plumbing instruments; and itconsists of a chambered bar provided with a pivoted spiritlevel and ashaft and cam for adjusting the same to an extent indicated by a pointeron the shaft, as fully set forth hereinafter and as illustrated in theaccompanying drawings, in which Figure 1 is a view in part longitudinalsection, illustrating my improved instrument; Fig. 2, an edge view inpart section; Fig. 3, a side view showing the pointer and graduations.

The body of the instrument is a bar A, which is recessed from one edgenear the end to form a chamber as, and within the latter a spirit-levelB of any suitable character is pivoted by a transverse pivot or pin 1.Through the bar and through the chamber beneath the free end of thelevel extends a shaft 0, upon which is a cam 3, the latter beingarranged so that the free end of the level will rest thereon, as shown.At one end of the shaft is a pointer 4, which as the shaft is turned canbe carried over a series of graduations upon the face of the bar or,preferably, upon a plate 5, secured to the bar. These graduations are ofsuch a character in respect to the level and the form of the cam thatthe graduation or mark opposite the pointer in any position to which itmay be set will indicate the inclination of the bar when the level ishorizontal either in degrees or the number of inches in a given numberof feet, as may be desired.

chamber and thread the outer end of the' shaft to receive a nut D, whichbears upon the side of the bar or upon a plate 6.

To retain the level from swinging outward, and to cover the chamber :1),I provide a plate 7, secured to the edge of the bar above the chamberand with a recess through which the bubble of the level may be observed.

WVithout limiting myself to the precise construction and arrangementshown, I claim 1. A leveling and plumbing instrument consisting of a barhaving a chamber therein, a level pivoted within said chamber, a shaftextending transversely through said chamber and through the bar, a camon the shaft below the level, and a pointer onsaid shaft outside thebar, the latter having a graduated scale adjacent to the pointer,substantially as described.

2. The combination of the chambered bar, a level pivoted therein, ashaft extending through the bar and provided with a cam on which thelevel rests, with a pointer, and with a shoulder opposite the inner wallof the chamber, and a nut on the shaft whereby said shoulder may bebrought into frictional contact with the said wall, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN A. MCCAIN.

Witnesses;

JAS. B. 11011, JOHN W. JoNns.

